The OptiMate monitor O-126v2 is a battery status/charge system monitor for 12V lead-acid & 12.8V lithium-ion, with an AUTO/DIN plug. The O-126v2 charge level monitor is an SAE to DIN/AUTO 12V socket adapter with state of charge monitor that plugs directly into your motorcycle, ATV/ SxS, car, pick-up truck, or boat's 12V power port – Adapter with 24-7 battery status at a blink of an LED! O-126v2 features a length of 10”/25cm.